=2m ⇒AB= diameter =d=2×2=4m Using the concept of conservation of energy, Total energy at point X= Total energy at point Y Total energy at point X= Total energy at point Y. ⇒mgh+0=
1
2
mv2+0 h=
v2
2g
....(i) Since, body just completes motion in vertical circle, hence v=√5gr.....(ii) From Eqs. (i) and (ii), we get h=